Improvement in grinding-mills



A. STEVENSONV& s. WYLDE Grinding-Mill.

No. 216,906. Patehted June 24,1879;

N4 PETERS, PM PHER. WASHINGTON, D C.

UNITED STATES PATENT OFFICE.

I ANTHONY sTEvENsON, O CHESTER, AND SAMUEL WYLDE, OF RUNGORN,

0 COUNTY OF CHESHIRE, ENGLAND.

IMPROVEMENT lN GRINDING-MILLS.

Specification forming part of Letters Patent No. 216,906, dated June 24,1879; application filed March 16, 1878.

. To all whom it may concern:

Be it known that we, ANTHONY STEVEN- soN, of Chest-er, Cheshire county,and SAM- UEL VVYLDE, of Runcorn, Cheshire county, England, have inventedcertain Improvements in Grinding-Mills, of which the following is aspecification.

Our invention relates particularly and exclusively to that ordinary formof flour-mill in which the grinding operation is performed by twohorizontal stones running one upon the other; and the object of theinvention is to maintain at all times a perfect parallelism between thefaces of the stones, and prevent the runner-stone from canting, tipping,or touching the face of the bed-stone, as con stantly happens in themills as ordinarily constructed.

With this end in view the invention consists in combining with therunner-stone an annular track or rail and supporting-rollers, arrangedto guide the stone accurately, and made adjustable, so that therunner-stone may be raised or lowered, to compensate for Wear or changethe distance between the stones.

same, with portions of the frame-work broken away in order to expose theguide devices to view.

A and B represent respectively, the bed and the runner stones of themill, which may be constructed, arranged, and supported in theordinarymanner, the upper stone being provided ,with the ordinarysupporting-bail and driver, acting in connection with the spindle O, asusual, or driven in any other suitable manner.

D represents the continuous rail or guide surrounding the upper stone,and riveted, bolted, or otherwise secured firmly thereto.

The rail represented in the drawings has an upwardly-extending flange,through which rivets are passed into the ordinary metal bandencirclingthe stone, whereby the rail is secured firmly to the stone.The under face of the rail or guide D is turned mathematically straightand true, and is adjusted so as to be exactly parallel with the underface of the stone.

E E represent three rollers, arranged at equal distances apart under therail or guide D, to form a support therefor, the rollers being mountedin the upper ends of vertically threaded bolts G, the lower ends ofwhich are passed through fixed guides H, and provided with end nuts orwheels, I, resting upon the lower guides, as shown, so that by turningthe nuts or wheels the rollers may be adjusted vertically with greatnicety.

It will be seen that the rollers E, being properly adjusted at'an equalheight to bear under the rail or guide D, effectually prevent the stonefrom tipping or turning in the slightest degree.

It will thus be seen that the runner-stone is caused to rotateaccurately in a horizontal position, and that a uniform space ismaintained at all points between its edge and that of the bed-stoneunder all circumstances.

If desired, the rollers maybe adjusted to sustain the entire weight ofthe runnerstone,

in which case the spindle will merely serve the purpose of rotating thestone; but it is preferred to have the weight of the stone sustained bythe spindle, as usual, and to have the rollers adjusted to bear closely,but with a very slightpressure, against the rail or guide.

Instead of the arrangement shown, the rollers may be attached to thestone, and the rail or guide D attached to the adjustable rods or toother suitable supports, as before suggested.

It is manifest that in place of the rollers a continuous rail or othersupport may be arranged to act in connection with the guide D; that therollers may be mounted and adjusted by any suitable mechanism other thanthat shown; also, that the rail or track may be placed upon the top of,instead of around the periphery of, the stone.

By our improvement we are enabled to secure a steady and accuratemovement of the stone under all conditions, and thus to pronation of anannular track or rail and verti-- duce a flour of a uniformgranulation,Whether Cally-adjustable rollers with the runner-stone.

coarse or fine. ANTHONY STEVENSON.

Having thus described our invention, what SAMUEL WYLDE. 1 we claim isWitnesses:

As an improvement in the ordinary hori- P. T. DODGE, zontal-disk-aotiongrinding-mills, the combi- SML. BEAN.

